The Seasiders were denied a point in a compelling Barclays Premier League derby when Brett Emerton struck a Blackburn winner four minutes into injury time at Bloomfield Road.
Holloway felt there was a suspicion of offside and that Gary Taylor-Fletcher was fouled in the build-up to the goal.
He claimed overlooking the incidents were among several questionable decisions by Dean.
Holloway said: "I thought the referee had a poor game and he is going to report me for what I said to him in the tunnel.
"I can't believe what he saw.
"I thought there was some unbelievably strange decisions out there.
"I waited for him in the tunnel. Never mind, I have got to learn and I should know better - but it is ridiculous."